<template>
  <view class="wrapper">
    <SearchBar @search="toSearchList" />
    <view class="history-search">
      <view class="title">
        <text class="title">历史搜索</text>
        <icon type="clear" size="18" @click="clearHistory"> </icon>
      </view>
      <view>
        <view
          v-for="(item, index) in keywordList"
          :key="index"
          @click="toSearchList(item)"
          >{{ item }}</view
        >
      </view>
    </view>
  </view>
</template>

<script>
import SearchBar from '../../components/SearchBar'

const KEYWORD_LIST = 'keyword_list'

export default {
  components: {
    SearchBar
  },
  data () {
    return {
      keywordList: []
    }
  },
  // onShow会在页面启动时和从其他页面返回时都会触发
  onShow () {
    this.keywordList = wx.getStorageSync(KEYWORD_LIST) || []
  },
  methods: {
    // 清空历史搜索
    clearHistory () {
      // 弹框提示
      wx.showModal({
        title: '提示',
        content: '你确定要清空历史搜索吗?',
        success: res => {
          if (res.confirm) {
            // 清空界面
            this.keywordList = []
            // 清空的是storage
            wx.removeStorageSync(KEYWORD_LIST)
          }
        }
      })
    },
    toSearchList (inputVal) {
      // 头部插入并去重
      let _keywordList = [inputVal, ...this.keywordList]
      _keywordList = [...new Set(_keywordList)]
      // 把历史搜索数据存到storage
      wx.setStorageSync(KEYWORD_LIST, _keywordList)

      // 跳转搜索列表并传参
      wx.navigateTo({
        url: '/pages/search_list/main?catName=' + inputVal
      })
    }
  }
}
</script>

<style lang="less">
.search {
  background-color: #eee;
  padding: 30rpx 15rpx;
  display: flex;
  justify-content: space-between;
  font-size: 28rpx;
  position: relative;

  icon {
    position: absolute;
    top: 50rpx;
    left: 38rpx;
  }

  input {
    height: 60rpx;
    flex: 1;
    background-color: #fff;
    padding-left: 70rpx;
    box-sizing: border-box;
    border-radius: 4rpx;
  }

  button {
    width: 160rpx;
    height: 60rpx;
    line-height: 60rpx;
    border-radius: 8rpx;
    font-size: 28rpx;
    border: 1rpx solid #bfbfbf;
    background-color: #eee;
    margin-left: 20rpx;
  }
}

.history-search {
  color: #333;
  font-size: 28rpx;
  padding: 30rpx 30rpx 30rpx 15rpx;

  .title {
    display: flex;
    justify-content: space-between;
  }

  view {
    display: flex;
    flex-wrap: wrap;
    margin-top: 30rpx;

    view {
      height: 64rpx;
      line-height: 64rpx;
      padding: 0 26rpx;
      background-color: #ddd;
      margin: 0 30rpx 16rpx 0;
    }
  }
}
</style>
